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← GeographyWhich mechanism increases sediment deposition within an alluvial channel lacking vegetation?
A)Decreased boundary shear stress✓
B)Increased flow channel roughness
C)Reduced sediment availability upstream
D)Greater channel sinuosity increase
💡 Explanation
Decreased boundary shear stress causes sediment deposition because a reduction in flow energy no longer suspends particles, therefore, sediment settles out of suspension, rather than continued erosion, due to the force overcoming gravity in the alluvial absence of vegetation to slow its momentum.
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